Boiler-tube-cutting device



F. W. LARC Dec. 25., 1927. 1,653,186

BOILER TUBE CUTTING DEVICE Original Filed July 13, 1925 A I mentor fi flaw? Wjara Attorney Ill Patented Dec. 20, 1927.

UNITEDI S-TATES FRANK WILLIAM m ne, or MonoLovA, MEXICO.

Original application filed July 13, 1925,

The present invention relates generally to cutting devices, and more particularly to sub ect matter which has been divided from my-pendmg appllcatlon bearing Serial No.

48,890, filed July 13, 19:25. I I The object of the invention is to provide an adjustable cutter wherebythe tube may be cut a distance from the end thereof or at the end thereof as may be desired and one which is simple, compact, and efficient in construction, one which is horoughly reliable in its operation, convenient to handle and manipulate, inexpensive to manufacture, strong, durable, and otherwise well adapted to the purpose for which it is designed.

With the above and. numerous other ob jects in view as will appear as the description proceeds, the invention resides in certain novel features of construction and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing?- Figure 1 is an elevation of a device em bodying the features of my invention showing the same in operative association with a boiler tube,

Fig. 2 is a longitudinal section therethrough,

Fig. 3 is a transverse section therethrough, taken substantially on the line 33 of Fig. 2, looking in the direction of the arrow, and

Fig. 4 is a detail perspective view of the cutter knife.

Referring to the drawing in detail, it will be seen that there has been illustrated a boiler B provided with the usual tube T for the purpose of demonstrating the utility and operation of my improved device. A mandrel is denoted by the numeral 40 and is provided with a plurality of indentures 41 which are arranged in spaced series of circles. A ring 42 is disposed about the mandrel 40 and a plurality of set screws 42 are threaded through suitable openings providedtherein for engaging the indentures 41 to hold the ring in differentadjusted positions,

on the mandrel.

The mandrel 40 is provided with a cylindrical longitudinally extending bore 43, a portion of the Wall thereof. being tapered inwardly as at 44 adjacent the inner end of the mandrel. A slot 45 extends transversely of the mandrel adjacent its inner end and knife 46 slidably extends therethrough. The

the desired manner.

I BOILER-TUBE-CUTTING DEVICE.

Serial No. 43,390; Divided and this application filed February 16',

Serial No. 88,703.

body of this knife has at one end a cutting edge 46 and at its other end a T-shaped slot 47. A pin 48 is provided at its inner end with a slanting side edge having thereon a T-shaped rib 50, adapted to slidably engage in the T-shaped slot 47. p

The pin 48 extends longitudinally through the bore of the mandrel and thus by moving this pin 48, the knife 46 may be moved transversely of the mandrel and thus may be forced into biting engagement with the inner surface of the tube G ofthe boiler B. it

By turning the pin through its handle 51 the mandrel and associated parts may be turned, in order that the knife may cut the tube in strip 52 isprovided on the straight edge of A reinforcing runner the pin 48, one endthereof being curved upwardly as at 53 and is held in engagement with the end of the pin by a screw 54. This upwardly curved end 53 functions as a stop to prevent the knife 46 sliding off the smaller end of the pin 48. This strip prevents excessive wear on the pin as it is forced inwardly and the slanting edge of the pin functions as an inclined plane for forcing the knife into biting engagement with the inner surface of the tube T.

From the above it willbe apparent that I I have produced a device, which may be effectively and conveniently used 1n cutting out tubes of a boiler, by one possessed of very little skill, because of the simplicity of the device and compactness of the structure, and the ease with which it may be adjusted, assembled, and disassembled. The

present embodiment of the invention has been disclosed in detail merely by way of example, since in actual practice it attains the features of advantage enumerated as desirable in the statement of the invention and the above description.

It'will be apparent that the changes in the details of construction, and in the COIIlbination and arrangement of parts may be resorted to withoutv departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any'of its advantages.

Wards and to one endthereof, said inandril provided with a transversely extending opening, a blade extending through the opening and having its inner edge cooperating with said side edge, one of said edges being formed With a T-shaped rib and the other edge being formed with a T-shaped slot for the reception of the T-shaped ridge,

and a reinforcing runner strip fixed to the other edge of the pin. to engage with the inner Wall of the bore, said runner strip be-- ,ing extended up over said one endof the FRANK YVILLIAM LARC. 

